Other
Scientific paper
May 1922
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1922pdao....2..147p&link_type=abstract
Publications of the Dominion Observatory Ottawa, vol. 2, pp.147-158
Other
12
Scientific paper
This is one of a restricted programme of Oe and Oe5 stars whose spectroscopic investigation was undertaken by the writer. The spectrum appears to be about midway between Oe and Oe5 showing traces of emission for the hydrogen and some of the helium lines. The binary character was shown by the first plate in which the spectra of both components with large relative displacement appeared. The orbit was satisfactorily determined from 30 spectrograms. The period of 14.4 days, owing to the exceptional mass it entailed, was carefully checked up and the elements were corrected by least-squares. The eccentricity is small, 0.035, but the amplitudes large, K_1=206.4, K_2=246.7 km, which with a period of 14.414 make it very massive. The masses, multiplied by the cube of the sine of the inclination, are respectively 75.6 and 63.2 times the sun, nearly four times greater than any previously determined. These are minimum values and while the average values would be about 60 per cent greater, further considerations show the actual values are almost certainly 14 per cent greater than the stated values. Estimates of the absolute brightness obtained by considering its probable surface brightness -4.0 magnitude and its density 0.01 with respect to the sun on the one hand and from Eddington's theoretical treatment on the other agree in making the absolute magnitude of the brighter star -5.65, of the fainter -5.4, corresponding to a parallax of 0".00035, a distance of nearly 10,000 light years. The velocity of the system 23.9 km is nearly 8 km more positive than that given by the stationary calcium lines. This difference is in the right direction but about three times too great to be explained by the relativity displacement which would require the inadmissible density of 0.4 times the sun to account for the whole difference.
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